I had that for a while. Tight fit in most issued bdu pants. Make you feel like you are walking around with a square metal box in your poket (lil painful on the tight and knee at first). Not really that waterproof. You have to use their wet bags for the content. I can achieve similar result with couple of ziplocks. Items in the outside pockets didn't want to stay in. Not a good product but made very nicely.
Also don't bother with the 5.11 pouch. It is also way to big and uncomfortable.
Looking for a nice rig? Try this:
http://www.countycomm.com/POCKETORGANIZER.htmI have it and I stand by it. If you want to make it waterproof just throw in few ziplocks. It sits nicely in the pockets and can fit variety of pants. Inside has nice loops for holding stuff and is pretty packable.